Move CPUFeatures to core/

Move CPUFeatures.cpp, CPUFeatures.zig from bindings/ to core/.
Updated import in crash_handler.zig.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/crash_handler.zig

@@ -2288,7 +2288,7 @@ comptime {
     }
 }
 
-const CPUFeatures = @import("./buntime/bindings/CPUFeatures.zig");
+const CPUFeatures = @import("./buntime/core/CPUFeatures.zig");
 const builtin = @import("builtin");
 const std = @import("std");
 const windows = std.os.windows;